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  2. Shark tooth - Wikipedia

    en.wikipedia.org/wiki/Shark_tooth

    Any fossils, including fossil shark teeth, are preserved in sedimentary rocks after falling from their mouth. [13] The sediment that the teeth were found in is used to help determine the age of the shark tooth due to the fossilization process. [15] Shark teeth are most commonly found between the Upper Cretaceous and Tertiary periods. [16]

  3. Sawfish - Wikipedia

    en.wikipedia.org/wiki/Sawfish

    Sawfish, also known as carpenter sharks, are a family of rays characterized by a long, narrow, flattened rostrum, or nose extension, lined with sharp transverse teeth, arranged in a way that resembles a saw. They are among the largest fish, with some species reaching lengths of about 7–7.6 m (23–25 ft). [1]

  4. Fish jaw - Wikipedia

    en.wikipedia.org/wiki/Fish_jaw

    Some fish like carp and zebrafish have pharyngeal teeth only. [30] [31] Sea horses, pipefish, and adult sturgeon have no teeth of any type. In fish, Hox gene expression regulates mechanisms for tooth initiation. [32] [33] While both sharks and bony fish continuously produce new teeth throughout their lives, they do so via different mechanism.

  5. Ancient shark-like fish appeared much earlier than ... - AOL

    www.aol.com/ancient-shark-fish-appeared-much...

    A handful of fossil teeth from a completely new species suggests the creatures emerged some 440 million years ago. Ancient shark-like fish appeared much earlier than previously thought – study ...

  6. Animal tooth development - Wikipedia

    en.wikipedia.org/wiki/Animal_tooth_development

    In fish, Hox gene expression regulates mechanisms for tooth initiation. [1] [2] However, sharks continuously produce new teeth throughout their lives [3] [4] [5] via a drastically different mechanism. Shark teeth form from modified scales near the tongue and move outward on the jaw in rows until they are eventually dislodged. [6]

  7. Elasmobranchii - Wikipedia

    en.wikipedia.org/wiki/Elasmobranchii

    The teeth are in several series; the upper jaw is not fused to the cranium, and the lower jaw is articulated with the upper. The details of this jaw anatomy vary between species, and help distinguish the different elasmobranch clades. The pelvic fins in males are modified to create claspers for the transfer of sperm. There is no swim bladder ...

  8. Fluorapatite - Wikipedia

    en.wikipedia.org/wiki/Fluorapatite

    Fluorapatite is found in the teeth of sharks and other fishes in varying concentrations. It is also present in human teeth that have been exposed to fluoride ions, for example, through water fluoridation or by using fluoride-containing toothpaste. The presence of fluorapatite helps prevent tooth decay or dental caries. [6]

  9. Here's the Real Difference Between Baking Soda and Baking ...

    www.aol.com/lifestyle/heres-real-difference...

    But you can make your own baking powder: combine 2 tablespoons of baking soda with 1/4 cup of cream of tartar and pass it several times through a sifter. Some cooks believe the DIY baking powder ...

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